| Zugriffsnummer | 22004 |
| Dokumenttyp | Konferenzartikel |
| Sprache | Englisch |
| Titel | Status of the international effort on the x-ray crystal density work and its progress towards a measurement of the Avogadro constant |
| Autor(in); Institution |
Fujii, K.; National Metrology Institute of Japan (NMIJ), AIST, Tsukuba, JAPAN
Waseda, A.; National Metrology Institute of Japan (NMIJ), AIST, Tsukuba, JAPAN
Kuramoto, N.; National Metrology Institute of Japan (NMIJ), AIST, Tsukuba, JAPAN
Becker, Peter; 4.3, Quantenoptik und Längeneinheit, PTB-Braunschweig
Nicolaus, Arnold; 5.4, Interferometrie an Maßverkörperungen, PTB-Braunschweig
Krumrey, Michael; 7.1, Photonenradiometrie, PTB-Berlin
Danzebrink, Hans-Ulrich; 5.2, Dimensionelle Nanometrologie, PTB-Braunschweig
Busch, Ingo; 5.1, Oberflächenmesstechnik, PTB-Braunschweig
Bettin, Horst; 3.3, Chemisch-Physikalische Stoffeigenschaften, PTB-Braunschweig
Mana, G.; Istituto Nazionale di Ricerca Metrologica (INRIM), Torino, ITALY
Massa, E.; Istituto Nazionale di Ricerca Metrologica (INRIM), Torino, ITALY
Valkiers, S.; Institute for Reference Materials and Measurements (IRMM), European Commission-JRC, Geel, BELGIUM
Giardini, W.; National Measurement Institute (NMI), Lindfield, NSW, AUSTRALIA
Kessler, E.; National Institute of Standards and Technology (NIST), Gaithersburg, MD, USA
Downes, S.; National Physical Laboratory (NPL), Teddington, UK
Picard, A.; Bureau International des Poids et Mesures (BIPM), Sèvres, FRANCE
Riemann, H.; Institut für Kristallzüchtung (IKZ), Berlin, GERMANY
|
| Quelle/Jahr | 2008 Conference on Precision Electromagnetic Measurements digest:(2008), 300 - 301 |
| Herausgeber(in) |
Cookson, Alan H.
|
| ISBN | 978-1-424-42399-6 ; 978-1-424-42400-9 (CD-ROM) |
| Verlag | Piscataway, NJ: IEEE |
| Konferenzangaben | Conference on Precision Electromagnetic Measurements, CPEM 2008, Broomfield, Colorado, 08-13, June, 2008, USA |
| Zusammenfassung | The present status of an international attempt of several national metrology institutes to determine the Avogadro constant with a relative standard uncertainty better than 2 × 10-8 is presented. To this end, a world-wide collaboration has been set up to produce a 5 kg 28Si single crystal with an enrichment factor greater than 99.985 %. Technological steps for the growth on the 28Si single crystal, manufacturing of two 1 kg 28Si spheres, and first experimental results are reported. |
Zitierung
Fujii, K., Waseda, A., Kuramoto, N., Becker, P., Nicolaus, A., Krumrey, M., Danzebrink, H.-U., Busch, I., Bettin, H., Mana, G., Massa, E., Valkiers, S., Giardini, W., Kessler, E., Downes, S., Picard, A., & Riemann, H. (2008). Status of the international effort on the x-ray crystal density work and its progress towards a measurement of the Avogadro constant. Conference on Precision Electromagnetic Measurements, CPEM 2008, Broomfield, Colorado, 08-13, June, 2008, USA.